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WGU Data Management – Foundations Exam Sample Questions (Q10-Q15):

NEW QUESTION # 10
How can a primary key constraint be added after the table is created?

A. By using an UPDATE clause
B. By using the CREATE TABLE statement
C. By using an ALTER clause
D. By using an INSERT INTO clause

Answer: C

Explanation:
Toadd a primary key constraint after table creation, we use theALTER TABLEstatement.
Example Usage:
sql
ALTER TABLE Employees
ADD CONSTRAINT PK_Employees PRIMARY KEY (EmpID);
* Thisaddsa primary key to the EmpID columnafter the table was created.
Why Other Options Are Incorrect:
* Option B (CREATE TABLE) (Incorrect):Used for defining constraintsduringtable creation, not after.
* Option C (UPDATE) (Incorrect):Modifiesrow values, not constraints.
* Option D (INSERT INTO) (Incorrect):Used toadd datato a table, not modify constraints.
Thus, the correct answer isALTER TABLE, as itmodifies table structure to add a primary key constraint.

NEW QUESTION # 11
Which relationship is shown in the following diagram?

A. Unary relationship
B. Many-to-many
C. Intersection data
D. Associative entity

Answer: A

Explanation:
The given diagram represents a unary relationship (also called a recursive relationship), which occurs when an entity is related to itself. In this case, salespersons back each other up, meaning a salesperson is associated with another salesperson from the same entity.
Key Observations from the Diagram:
* Single Entity (Salesperson)
* The table contains only one entity type, Salesperson, which has attributes such as Salesperson Number, Name, Commission, Percentage, and Year of Hire.
* Self-Referencing Relationship (Backs-up and Backed-up by)
* The diagram shows that a salesperson can back up another salesperson.
* This means that the relationship exists within the same entity rather than between two different entities.
* Cardinality (One-to-One Relationship in a Unary Form)
* The notation ( |-| ) in the ER diagram indicates a one-to-one recursive relationship.
* One salesperson can back up only one other salesperson, and each salesperson is backed up by only one.

NEW QUESTION # 12
Which statement is associated with two separate entities?

A. Entity type
B. Relationship
C. Attribute
D. Reflexive relationship

Answer: B

Explanation:
Arelationshipin an ER model defineshow two separate entities interact.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Customers (
CustomerID INT PRIMARY KEY,
Name VARCHAR(50)
);
CREATE TABLE Orders (
OrderID INT PRIMARY KEY,
CustomerID INT,
FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)
);
* Customers and Orders are separate entities, related via CustomerID.
Why Other Options Are Incorrect:
* Option A (Reflexive relationship) (Incorrect):Used forself-referencing entities, not two different entities.
* Option B (Entity type) (Incorrect):Defines aclass of objects, but does not establish relationships.
* Option D (Attribute) (Incorrect):Attributesdescribeentities but do not connect them.
Thus, the correct answer isRelationship, as it connectstwo separate entities.

NEW QUESTION # 13
Where does a primary key traditionally appear in a table?

A. In the table header
B. In the top row
C. In the first column
D. In the last visible column

Answer: C

Explanation:
Bydatabase design conventions, theprimary key is usually placed in the first columnof a table to make it easy to identify and reference.
Example Usage:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY, -- First column (convention)
Name VARCHAR(50),
Salary DECIMAL(10,2)
);
* EmpID is placed as the first columnfor clarity and quick access.
Why Other Options Are Incorrect:
* Option A (In the table header) (Incorrect):Table headers onlydisplay column names, they do not contain values.
* Option C (In the top row) (Incorrect):Thetop row contains data, not theprimary key definition.
* Option D (In the last visible column) (Incorrect):While technically possible,placing a primary key at the endisuncommonin database design.
Thus, the correct answer isIn the first column, as this is the standard convention in relational databases.

NEW QUESTION # 14
What is the role of a query processor in the database system architecture?

A. It writes log records before applying changes to the database.
B. It uses information from the catalog to perform query optimization.
C. It translates instructions into file system commands.
D. It sends results back to the application that requested the queries.

Answer: B

Explanation:
Aquery processoris responsible forquery optimization and executionin a database management system (DBMS). It analyzes SQL statements, optimizes execution plans, and ensures efficient retrieval of data.
* Option A (Correct):Thequery processoroptimizes queries by analyzing metadata from thesystem catalogto determine the best execution strategy.
* Option B (Incorrect):Logging transactionsbefore applying changes is the responsibility of the transaction manager.
* Option C (Incorrect):Translating instructions intofile system commandsis handled by thestorage manager, not the query processor.
* Option D (Incorrect):While the query processor helps retrieve results, thedatabaseengineandAPI layerare responsible for returning results to applications.

NEW QUESTION # 15
......

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Oliver Taylor Oliver Taylor

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Valid Test Data-Management-Foundations Test - Data-Management-Foundations Latest Exam Questions

WGU Data-Management-Foundations Latest Exam Questions - Data-Management-Foundations Question Explanations

WGU Data Management – Foundations Exam Sample Questions (Q10-Q15):

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Valid Test Data-Management-Foundations Test - Data-Management-Foundations Latest Exam Questions

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